The phrase "intitle:index of" is part of an advanced search query often used on search engines. It narrows the search results to pages that have the exact phrase "index of" in their title. This is commonly used to find directories or file indexes on websites, which can sometimes inadvertently expose sensitive information.
It is important to note that Google is constantly re-crawling and de-indexing malicious or sensitive content. However, the updated operator exploits a lag. A directory might be live for 24-48 hours before Google’s Safe Browsing or automated takedown bots remove it from search results. intitle index of secrets updated